| PLASMAS | As lamps are heating up to release hot gases (7) |
| WARMING | Battles with dynasty are heating up. (7) |
| RANSOME | Pay up to release last children's author? (7) |
| TENPINS | Snip net up to release bowling targets (7) |
| MERCURYRISING | Astrological indicator that things are heating up |
| RIPCORD | A ballooning device to release hot air originally, later a pullstring or handle to open a parachute (7) |
| LIGHTS | Illuminations such as lamps; or, divisions of mullion windows (6) |
| VENT | Hole at the top of a hot air balloon which enables the pilot to release hot air (4) |
| USED | Authorised to release hot air in a hand-me-down (4) |
| VOLCANO | A vent in the crust of Earth or another planet or satellite, from which issue eruptions of molten rock, hot rock fragments, and hot gases. Also: the subject of this puzzle. (7) |
| GREISEN | Light-coloured rock containing quartz and mica formed from the alteration of granite by hot gases from magma (7) |
| ONAROLL | Heating up, at the casino |
| BOILING | Heating up |
| PHUNGA | Have a hot drink, quietly heating up nice gammon as starters (6) |
| PSALM | Lamps are to be put out when singing it (5) |
| PYROCLASTICFLOW | A fluidized "flowing" mixture of hot rock fragments, hot gases, and entrapped air that moves at high speed in thick, gray-to-black, turbulent clouds that hug the ground. (11,4) |
| ANTEATER | Can't heater release hot and cold insect killer? (8) |
| GLOBALWARMING | Heating up of the earth (6,7) |
| FATHERING | Heating up odd fire as form of generation (9) |
| IGLOO | Where seal oil lamps are used |
